Pneumatic test plug



FIG. 1 is a front elevation view of a pneumatic test plug showing our new design, the rear elevation view being a mirror image thereof;

FIG. 2 is a side elevation view showing the pneumatic test plug of FIG. 1, the opposite side elevation view being a mirror image thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof.

The broken line showing of a product warning tag in FIG. 1 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a pneumatic test plug, as shown and described. 